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Article ; Online: Effects of Antibiotics on the DAMO Process and Microbes in Cattle Manure.

He, Ting / Yin, Qidong / Li, Xu

Environmental science & technology

2024 Volume 58, Issue 8, Page(s) 3883–3894

Abstract: Denitrifying anaerobic methane oxidation (DAMO) can mitigate methane emissions; however, this process has not been studied in cattle manure, an important source of methane emissions in animal agriculture. The objective of this study was to investigate ... ...

Abstract	Denitrifying anaerobic methane oxidation (DAMO) can mitigate methane emissions; however, this process has not been studied in cattle manure, an important source of methane emissions in animal agriculture. The objective of this study was to investigate the occurrence of DAMO microbes in cattle manure and examine the impacts of veterinary antibiotics on the DAMO process in cattle manure. Results show that DAMO archaea and bacteria consistently occur at high concentrations in beef cattle manure. During the long-term operation of a sequencing batch reactor seeded with beef cattle manure, the DAMO activities intensified, and DAMO microbial biomass increased. Exposure to chlortetracycline at initial concentrations up to 5000 μg L
MeSH term(s)	Cattle ; Animals ; Manure ; Methane ; Anti-Bacterial Agents/pharmacology ; RNA, Ribosomal, 16S/genetics ; Anaerobiosis ; Denitrification ; Bioreactors/microbiology ; Oxidation-Reduction ; Nitrites
Chemical Substances	Manure ; Methane (OP0UW79H66) ; Anti-Bacterial Agents ; RNA, Ribosomal, 16S ; Nitrites
Language	English
Publishing date	2024-02-12
Publishing country	United States
Document type	Journal Article
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.3c07135
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Article ; Online: Mechanistic understanding of acclimation and energy metabolism of acetoclastic methanogens under different substrate to microorganism ratios.

Chang, Huanhuan / Du, Bang / He, Kai / Yin, Qidong / Wu, Guangxue

Environmental research

2024 Volume 252, Issue Pt 3, Page(s) 118911

Abstract: Mechanistic understanding of acetoclastic methanogenesis is pivotal for optimizing anaerobic digestion for efficient methane production. In this study, two different operational modes, continuous flow reactor (CFR) and sequencing batch reactor (SBR), ... ...

Abstract	Mechanistic understanding of acetoclastic methanogenesis is pivotal for optimizing anaerobic digestion for efficient methane production. In this study, two different operational modes, continuous flow reactor (CFR) and sequencing batch reactor (SBR), accompanied with solids retention times (SRT) of 10 days (SBR
Language	English
Publishing date	2024-04-10
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2024.118911
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Article ; Online: Revealing impacts of operational modes on anaerobic digestion systems coupling with sulfate reduction.

Du, Jin / Zhou, Xingzhao / Yin, Qidong / Zuo, Jiane / Wu, Guangxue

Bioresource technology

2023 Volume 385, Page(s) 129431

Abstract: Anaerobic digestion (AD) is promising for treating high-strength wastewater. However, the effect of operational parameters on microbial communities of AD with sulfate is not yet fully understood. To explore this, four reactors were operated under rapid- ... ...

Abstract	Anaerobic digestion (AD) is promising for treating high-strength wastewater. However, the effect of operational parameters on microbial communities of AD with sulfate is not yet fully understood. To explore this, four reactors were operated under rapid- and slow-filling modes with different organic carbons. Reactors in the rapid-filling mode generally exhibited a fast kinetic property. For example, the degradation of ethanol was 4.6 times faster in ASBR
MeSH term(s)	Anaerobiosis ; Bioreactors ; Wastewater ; Sulfur Oxides ; Sulfates/metabolism ; Ethanol ; Methane/metabolism
Chemical Substances	Wastewater ; Sulfur Oxides ; Sulfates ; Ethanol (3K9958V90M) ; Methane (OP0UW79H66)
Language	English
Publishing date	2023-06-30
Publishing country	England
Document type	Journal Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2023.129431
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Article ; Online: Revealing impacts of operational modes on anaerobic digestion systems coupling with sulfate reduction

Du, Jin / Zhou, Xingzhao / Yin, Qidong / Zuo, Jiane / Wu, Guangxue

Bioresource Technology. 2023 Oct., v. 385 p.129431-

2023

Abstract	Anaerobic digestion (AD) is promising for treating high-strength wastewater. However, the effect of operational parameters on microbial communities of AD with sulfate is not yet fully understood. To explore this, four reactors were operated under rapid- and slow-filling modes with different organic carbons. Reactors in the rapid-filling mode generally exhibited a fast kinetic property. For example, the degradation of ethanol was 4.6 times faster in ASBRER than in ASBRES, and the degradation of acetate was 11.2 times faster in ASBRAR than in ASBRAS. Nevertheless, reactors in the slow-filling mode could mitigate propionate accumulation when using ethanol as organic carbon. Taxonomic and functional analysis further supported that rapid- and slow-filling modes were suitable for the growth of r-strategists (e.g., Desulfomicrobium) and K-strategists (e.g., Geobacter), respectively. Overall, this study provides valuable insights into microbial interactions of AD processes with sulfate through the application of the r/K selection theory.
Keywords	Desulfomicrobium ; Geobacter ; acetates ; anaerobic digestion ; ethanol ; organic carbon ; propionic acid ; sulfates ; wastewater ; Methane production ; r/K selection theory ; Sulfate reducing bacteria ; Metagenomics
Language	English
Dates of publication	2023-10
Publishing place	Elsevier Ltd
Document type	Article ; Online
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2023.129431
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Article: Solids Retention Times Shift Methanogenic Ethanol Oxidation: Novel Insights into Metabolic Pathways, Microbial Community Dynamics, and Energy Metabolisms

Xing, Lizhen / Li, Longxu / Yin, Qidong / Wu, Guangxue

ACS sustainable chemistry & engineering. 2021 Nov. 15, v. 9, no. 47

2021

Abstract: Solids retention time (SRT) is a key parameter affecting the performance of anaerobic digestion. Nevertheless, the knowledge of how SRT impacts the anaerobic ecosystem is still insufficient. In this study, the shifts in system performance, microbial ... ...

Abstract	Solids retention time (SRT) is a key parameter affecting the performance of anaerobic digestion. Nevertheless, the knowledge of how SRT impacts the anaerobic ecosystem is still insufficient. In this study, the shifts in system performance, microbial population, metabolic pathway, and energy metabolism induced by different SRTs (25 and 10 days) in anaerobic reactors with ethanol as the substrate were systematically investigated. Ethanol was oxidized to acetate and propionate, and methane was generated via mixotrophic pathways at SRT of 25 days due to the enrichment of ethanol oxidizers Geobacter and Pelobacter, propionate oxidizers Smithella, and methanogens Methanothrix. However, ethanol was metabolized to only acetate by Desulfovibrio which outcompeted other ethanol oxidizers and established interspecies H₂ transfer with H₂-utilizing methanogen Methanobacterium at a SRT of 10 days. Under short SRT conditions, acetoclastic methanogens were eliminated, resulting in the accumulation of acetate and low CH₄ yield. Additionally, the major ATPase-gene owners were shifted from bacteria (F-type ATPase) to methanogens (V/A-type ATPase) with decreasing SRT and pH, suggesting the energy-metabolism turnover of anaerobic microbes when encountering different SRTs.
Keywords	Desulfovibrio ; Geobacter ; Methanobacterium ; Pelobacter ; Smithella ; acetates ; adenosinetriphosphatase ; anaerobic digestion ; biochemical pathways ; ecosystems ; energy ; energy metabolism ; ethanol ; green chemistry ; methane ; methanogens ; microbial communities ; oxidation ; pH ; propionic acid
Language	English
Dates of publication	2021-1115
Size	p. 15861-15874.
Publishing place	American Chemical Society
Document type	Article
ISSN	2168-0485
DOI	10.1021/acssuschemeng.1c05535
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Article: New insights into the effect of ethanol and volatile fatty acids proportions on methanogenic activities and pathways

Du, Jin / Yin, Qidong / Gu, Mengqi / Wu, Guangxue

Environmental research. 2021 Mar., v. 194

2021

Abstract: During anaerobic digestion, methanogenic activities and pathways can be affected by intermediates. Here, the effects of intermediates acetate, propionate, and ethanol on methanogenesis were investigated. Four anaerobic sequencing batch reactors were ... ...

Abstract	During anaerobic digestion, methanogenic activities and pathways can be affected by intermediates. Here, the effects of intermediates acetate, propionate, and ethanol on methanogenesis were investigated. Four anaerobic sequencing batch reactors were acclimated with propionate (ASBR_P), ethanol/propionate (ASBR_EP), acetate/propionate (ASBR_AP), and ethanol/acetate/propionate (ASBR_EAP). Ethanol was the easiest one to be biodegraded, thereby enhancing the maximum methane production rate and shortening the lag phase, while the longest acclimation time and lowest methane production rate were observed in ASBR_P. Different microbial communities and syntrophic patterns existed in four reactors. Desulfovibrio and Geobacter were the dominant ethanol-oxidizing bacteria in ASBR_EP and ASBR_EAP, respectively. Both Desulfovibrio and Geobacter possessed the potential of extracellular electron transfer, which might be the advantage of ethanol dosage for enhancing methanogenesis through direct interspecies electron transfer. Methanosarcina was enriched in ASBR_P and ASBR_AP, while Methanosaeta in ASBR_EP and ASBR_EAP. Genes responsible for acetoclastic methanogenesis were significantly enriched in ASBR_EAP, possibly resulting in the highest methanogenic activity from acetate. Results from this study will advance the optimization of practical anaerobic systems, which can be achieved by regulating the intermediates with different fermenting pathways.
Keywords	Desulfovibrio ; Geobacter ; Methanosaeta ; Methanosarcina ; acclimation ; acetates ; anaerobic digestion ; electron transfer ; ethanol ; methane production ; methanogens ; propionic acid ; research
Language	English
Dates of publication	2021-03
Publishing place	Elsevier Inc.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2020.110644
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Article: Metagenomic analysis reveals the methanogenic, ATP, and potassium-transport metabolisms of anaerobic systems with different ammonia concentrations

Xing, Lizhen / Ma, Jialin / Yin, Qidong / Wu, Guangxue

Science of the total environment. 2021 Aug. 15, v. 782

2021

Abstract: Excessive ammonia is a well-known inhibitor of anaerobic wastewater treatment systems. In this study, responses of methanogenic activity and pathway, microbial communities, adenosine triphosphatases (ATPase) system, and potassium (K⁺) transport system to ...

Abstract	Excessive ammonia is a well-known inhibitor of anaerobic wastewater treatment systems. In this study, responses of methanogenic activity and pathway, microbial communities, adenosine triphosphatases (ATPase) system, and potassium (K⁺) transport system to different ammonia concentrations were investigated. The long-term acclimation with 1 g NH₄⁺-N/L of ammonia decreased the methanogen abundance by more than 13% and shifted the dominant methanogen from Methanothrix to Methanosarcina. In the acetate-substrate reactor, genes encoding methanogenesis, ATPase, and K⁺ transport systems were suppressed. However, in the reactor fed with ethanol and acetate, the long-term acclimation with ammonia enriched ammonia-tolerant syntrophic bacteria (i.e., Geobacter) with a high abundance of ATPase and K⁺ transport genes. The robust ethanol oxidation and ammonia-detoxicate activities benefited the subsequent methanogenesis (including acetoclastic methanogenesis), increasing 78% of the maximum methane production rate, compared with the control reactor. Direct interspecies electron transfer-capable partners and PilA genes were both detected under 1 g NH₄⁺-N/L of ammonia condition.
Keywords	Geobacter ; Methanosarcina ; acclimation ; acetates ; adenosinetriphosphatase ; ammonia ; environment ; ethanol ; metagenomics ; methane production ; methanogens ; oxidation ; potassium ; wastewater treatment
Language	English
Dates of publication	2021-0815
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2021.146911
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Article: Microbial physiology and interactions in anammox systems with the intermittent addition of organic carbons

Zhang, Tianqi / Yin, Qidong / Shi, Yunhong / Wu, Guangxue

Bioresource technology. 2021 Jan., v. 319

2021

Abstract: Organic carbon can affect nitrogen removal in the anaerobic ammonia oxidation (anammox) process. Two continuous up-flow anaerobic sludge blanket (UASB) reactors were operated under autotrophic (UASBN, without organic carbon) and mixotrophic (UASBCN, with ...

Abstract	Organic carbon can affect nitrogen removal in the anaerobic ammonia oxidation (anammox) process. Two continuous up-flow anaerobic sludge blanket (UASB) reactors were operated under autotrophic (UASBN, without organic carbon) and mixotrophic (UASBCN, with the intermittent addition of acetate and propionate) conditions. Stable operation of anammox systems was achieved, with the nitrogen removal rate and percentage of 2.12 g/(L·d) and 86.4% in UASBN, and 2.09 g/(L·d) and 85.0% in UASBCN, respectively. The network of Candidatus Kuenenia, Thauera, and Nitrosomanas contributed to both nitrogen and carbon metabolisms, and the intermittent addition of acetate and propionate strengthened Ca. Kuenenia's ability to utilize several types of carbon sources. Anammox bacteria showed activity in the presence of organic carbon and without inorganic carbon, confirming the mixotrophic characteristic of Ca. Kuenenia. Cross-feeding of amino acids and vitamins existed among functional microorganisms, with extracellular polymeric substances acting as the media for microbial interactions.
Keywords	Thauera ; acetates ; anaerobic ammonium oxidation ; inorganic carbon ; microbial physiology ; nitrogen ; organic carbon ; polymers ; propionic acid ; upflow anaerobic sludge blanket reactor
Language	English
Dates of publication	2021-01
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2020.124226
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Article ; Online: Advances in direct interspecies electron transfer and conductive materials: Electron flux, organic degradation and microbial interaction.

Yin, Qidong / Wu, Guangxue

Biotechnology advances

2019 Volume 37, Issue 8, Page(s) 107443

Abstract: Direct interspecies electron transfer (DIET) via electrically conductive pili (e-pili) and c-type cytochrome between acetogens and methanogens has been proposed as an essential pathway for methane production. Supplements of conductive materials have been ...

Abstract	Direct interspecies electron transfer (DIET) via electrically conductive pili (e-pili) and c-type cytochrome between acetogens and methanogens has been proposed as an essential pathway for methane production. Supplements of conductive materials have been extensively found to promote methane production in microbial anaerobic treatment systems. This review comprehensively presents recent findings of DIET and the addition of conductive materials for methanogenesis and summarizes important results through aspects of electron flux, organic degradation, and microbial interaction. Conductive materials improve DIET and methanogenesis by acting as either substitute of e-pili or electron conduit between e-pili and electron acceptors. Other effects of conductive materials such as the change of redox potential may also be important factors for the stimulation. The type and organic loading rate of substrates affect the occurrence of DIET and stimulating effects of conductive materials. Geobacter, which can participate in DIET, were less enriched in anaerobic systems cultivated with non-ethanol substrates, suggesting the existence of other syntrophs with the capability of DIET. The coupling of communication systems such as quorum sensing may be a good strategy to achieve the formation of biofilm or granule enriched with syntrophic partners capable of DIET.
MeSH term(s)	Electron Transport ; Electrons ; Geobacter ; Methane ; Microbial Interactions
Chemical Substances	Methane (OP0UW79H66)
Language	English
Publishing date	2019-08-30
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Review
ZDB-ID	47165-3
ISSN	1873-1899 ; 0734-9750
ISSN (online)	1873-1899
ISSN	0734-9750
DOI	10.1016/j.biotechadv.2019.107443
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Article ; Online: The r/K selection theory and its application in biological wastewater treatment processes.

Yin, Qidong / Sun, Yuepeng / Li, Bo / Feng, Zhaolu / Wu, Guangxue

The Science of the total environment

2022 Volume 824, Page(s) 153836

Abstract: Understanding the characteristics of functional organisms is the key to managing and updating biological processes for wastewater treatment. This review, for the first time, systematically characterized two typical types of strategists in wastewater ... ...

Abstract	Understanding the characteristics of functional organisms is the key to managing and updating biological processes for wastewater treatment. This review, for the first time, systematically characterized two typical types of strategists in wastewater treatment ecosystems via the r/K selection theory and provided novel strategies for selectively enriching microbial community. Functional organisms involved in nitrification (e.g., Nitrosomonas and Nitrosococcus), anammox (Candidatus Brocadia), and methanogenesis (Methanosarcinaceae) are identified as r-strategists with fast growth capacities and low substrate affinities. These r-strategists can achieve high pollutant removal loading rates. On the other hand, other organisms such as Nitrosospira spp., Candidatus Kuenenia, and Methanosaetaceae, are characterized as K-strategists with slow growth rates but high substrate affinities, which can decrease the pollutant concentration to low levels. More importantly, K-strategists may play crucial roles in the biodegradation of recalcitrant organic pollutants. The food-to-microorganism ratio, mass transfer, cell size, and biomass morphology are the key factors determining the selection of r-/K-strategists. These factors can be related with operating parameters (e.g., solids and hydraulic retention time), biomass morphology (biofilm or granules), and operating modes (continuous-flow or sequencing batch), etc., to achieve the efficient acclimation of targeted r-/K-strategists. For practical applications, the concept of substrate flux was put forward to further benefit the selective enrichment of r-/K-strategists, fulfilling effective management and improvement of engineered pollution control bioprocesses. Finally, the future perspectives regarding the development of the r/K selection theory in wastewater treatment processes were discussed.
MeSH term(s)	Bioreactors ; Ecosystem ; Environmental Pollutants ; Nitrogen/metabolism ; Oxidation-Reduction ; Sewage ; Waste Water ; Water Purification
Chemical Substances	Environmental Pollutants ; Sewage ; Waste Water ; Nitrogen (N762921K75)
Language	English
Publishing date	2022-02-14
Publishing country	Netherlands
Document type	Journal Article ; Review
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2022.153836
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